13. Ogbolu DO, Oni AA, Daini OA, Oloko AP. In vitro antimicrobial properties of coconut oil on Candida species in Ibadan, Nigeria. J Med Food 2007; 10(2): 384–7. 61 14. te Velde ER, Eijkemans R, Habbema HD. Variation in couple fecundity and time to pregnancy, an essential concept in human reproduction. Lancet 2000; 355(9219): 1928–9. 62 15. World Health Organization. WHO Model Lists of Essential Medicines. 2017. http://www.who.int/medicines/publications/essentialmedicines/en/. 63 16. Cea-Soriano L, Garcia Rodriguez LA, Machlitt A, Wallander MA. Use of prescription contraceptive methods in the UK general population: a primary care study. BJOG 2014; 121(1): 53–60; discussion-1. 64 17. Superdrug/United Nations. Birth Control Around The World. 2017. https://onlinedoctor.superdrug.com/birth-control-around-the-world/. 65 18. Killick SR, Leary C, Trussell J, Guthrie KA. Sperm content of preejaculatory fluid. Hum Fertil (Camb) 2011; 14(1): 48–52. 66 19. National Health Service. Sexual and Reproductive Health Services – England 2016–17. https://digital.nhs.uk/catalogue/PUB30094. 67 20. Iversen L, Sivasubramaniam S, Lee AJ, Fielding S, Hannaford PC. Lifetime cancer risk and combined oral contraceptives: the Royal College of General Practitioners’ Oral Contraception Study. Am J Obstet Gynecol 2017; 216(6): 580 e1– e9. 68 21. Office For National Statistics. Cancer registration statistics, England. 2016. https://www.ons.gov.uk/peoplepopulationandcommunity/healthandsocialcare/ conditionsanddiseases/bulletins/cancerregistrationstatisticsengland/2016. 69 22. Cancer Research UK. Cancer mortality statistics. 2017. http://www.cancerresearchuk.org/health-professional/cancer-statistics/mortality/common-cancers-compared. 70 20. Iversen L, Sivasubramaniam S, Lee AJ, Fielding S, Hannaford PC. Lifetime cancer risk and combined oral contraceptives: the Royal College of General Practitioners’ Oral Contraception Study. Am J Obstet Gynecol 2017; 216(6): 580 e1– e9. 71 20. Iversen L, Sivasubramaniam S, Lee AJ, Fielding S, Hannaford PC. Lifetime cancer risk and combined oral contraceptives: the Royal College of General Practitioners’ Oral Contraception Study. Am J Obstet Gynecol 2017; 216(6): 580 e1– e9. 72 23. Gallo MF, Lopez LM, Grimes DA, Carayon F, Schulz KF, Helmerhorst FM. Combination contraceptives: effects on weight. Cochrane Database Syst Rev 2014; (1): CD003987.